Hi I have bought used Lenovo Yoga (refurbished) It had factory installed Windows 8. I've tried to activate Win8 and Win8.1 but without succes (activation server says key was blocked or key is wrong, i have checked a few of windows versions: core/pro, different languages) There is a license key inside BIOS, but i think it's missing marker in BIOS? Please look at attached screenshot. Currently computer is running Win10. Any ideas how can i activate Win8 properly?